Crown XTi series Service Manual page 164

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Subject:
BEFORE APPLYING POWER TO THIS UNIT, IT MUST PASS A HIPOT TEST FOR
SAFETY PURPOSES.
Application of Test Voltage
Basic Insulation
(primary (H and N) to ground)
Note: When testing with AC Hypot: If the ramp time is not long enough to charge the Y2 capacitors
before the actual Hypot test starts, the unit will fail the test because it sees the charging of the caps as
leakage and give a false result. If this happens, either lengthen the ramp time or use the VDC value
to verify the amp was assembled safely.
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Tech Note
Crown Technical Support
PO Box 1000 Elkhart IN 46515
Ph 800-342-6939/574-294-8200
Fax 574-294-8301
March 26, 2007
Tech Note #184 Rev. A
Discharge resistor modification procedure for all XTi, DSi, and CDi models.
HIpot Test voltage and connections
HIpot Test
1500 VAC or
2120VDC
Set-up the Unit Under Test (UUT) as described below:
• Attach the High Voltage wire (HV) to both prongs coming from the power cord
from the Unit Under Test.
• Attach the RETURN wire to the ground prong on the power cord from the Unit
Under Test.
• Turn the unit under test power button to the on position.
Test Time
Voltage (Dwell Time)
60 seconds
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:
High Limit (mA)
9(mA)
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